154 The American Geologist. September, 1903. 
is restudied in the light of provincial fauna?. The National 
Museum collection has the so-called Syringopora hisingcri but 
when compared with material from eastern Ontario the latter 
is seen to have the corallites from two to three times more ro- 
bust. S. maclurii appears to be present, also Favosites hemi- 
spliacricus turbinatus and Phillipsastraea verneuili. Acervul- 
aria david'soni in the Mississippian province is always in Ham- 
ilton faunas. Other significant Onondaga species of Whit- 
eaves' list are Romingeria umbellifera and Conocardium tri- 
gonale. The fish, Macropetalichtliys sullivanti, is, in Ohio, a 
Hamilton fossil. In the National Museum collection there is 
also a Spirifer closely related to 6". grieri, one of the character- 
istic species of the Onondaga. However, the eminently diag- 
nostic Onondaga brachiopods as Spirifer acuminatus, S. gre- 
garia, S. duodenaria, S. raricosta, S. macrothyris, S. manni, S. 
maccr, Mcristella nasuto, Pcntagonia iinisulcata, and Amphi- 
genia elongata are conspicuously absent. From these state- 
ments it is seen that while the Hudson's Bay and Mississip- 
pian Onondaga faunas have each their own facies, still both 
are of the faunal type characterizing the "American Pro- 
vince." This similarity of faunal facies probably indicates 
distinct basins but having intermittent connection. This con- 
nection seems to have persisted well into Hamilton time as 
Bell collected on Moose river Spirifer mucronatus which 
Whiteaves and Ami pronounce to be the variety thedfordensis. 
(2) If we examine the geological map of the United States 
by McGee, the "Western Sheet No. 783 of the Dominion of 
Canada," and Dawson's "Geological map of the northern part 
of the Dominion of Canada east of the Rocky mountains,"* it 
is seen that the Hudson's Bay Devonic is separated from the 
Mississippian sea by a wide territory (exceeding 300 miles) 
of pre-Cambrian, occupying the greater part of Ontario and 
Minnesota. These ancient rocks continue on the surface from 
western Ontario in a northwesterly direction, occupying a 
vast extent of the districts of Keewatin, Athabasca and Mac- 
kenzie, and separating the Eurasiatic o'r western Devonic of 
the Dakota sea from that of the Hudson's Bay. The western 
province in the arctic regions was shut out from the eastern 
by a belt of pre-Cambrian extending from eastern Mackenzie 
* McGkr. Fourteenth Ann. Rep. V. S. Gcol. Surv.. 1894; Da wson,. inn. Rep. 
Geol. Nat. Hist. Surv. Canada, n. ser. ii, 1887, p. 62R. 
